Safely button



FIG. 1 is a top front isometric view of a safety button showing my new design;

FIG. 2 is a bottom front isometric view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a front elevation view thereof, wherein the rear, left, and right elevation views are identical.

The portion of the safety button depicted in the figures in broken lines forms no part of the claimed design. 

CLAIM I claim the ornamental design for a safety button, as shown and described. 